Maliks Muwatta Book 48, Hadith Number 15.

Yahya related to me from Malik from Abu’z-Zinad from al-Araj from Abu Hurayra that the Messenger of Allah, may Allah bless him and grant him peace, said, “When you put on sandals, begin with the right foot. When you take them off, begin with the left foot. The right foot is the first to be put in the sandal and the last to be taken out.”